Back to results
US 4,295,112 AGranted
Residual current transformer
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYoshito Yamada, Hiroshi Okumura, Shoji Murakami
Life of this patent
Estimating the term…
Abstract
A residual current transformer comprises an annular magnetic core which has not a gap nor sectional part crossing said magnetic core but has one or more narrow sectional area parts.
Claims8
A residual current transformer, comprising:
- an annular core of magnetic material, said core including a continuous magnetic path within said core, said core including at least one portion wherein the longitudinal cross-section of said core is reduced with respect to the longitudinal cross-section of the remainder of said core;
- a first annular shield of magnetic material positioned concentric with respect to said core and located in parallel with a first side thereof;
- a second annular shield of magnetic material positioned concentric with respect to said core and located in parallel with a second side thereof;
- and
- a secondary coil wound about the exterior of said annular core, said secondary coil being located between said annular core and said first and second annular shields.
2 more elements
Dependencies are inferred from the claim text.